Soil Dynamics and Earthquake Engineering最新文献

{"title":"Seismic response control of tall building using semi-active tuned mass damper considering soil-structure interaction","authors":"Liangkun Wang ,&nbsp;Ying Zhou ,&nbsp;Zhongyi Zhou","doi":"10.1016/j.soildyn.2024.108987","DOIUrl":"10.1016/j.soildyn.2024.108987","url":null,"abstract":"<div><div>Soil-structure interaction (SSI) will change structural characteristics of a tall building, while parameters of the passive tuned mass damper (TMD) should be specifically optimized in this case. However, the structural model and soil parameters are full of uncertainties, and the seismic response mitigation of passive TMD suffers from the frequency and damping detuning. To improve its seismic performance, the semi-active TMD (STMD) is presented in this study, which can adjust frequency and damping ratio simultaneously. It can not only add or remove its mass to retune the frequency, but the eddy current damping ratio can also be adjusted in real time by reset the air gap, according to a developed output signals based solely combined algorithm. To verify its seismic mitigation performance preliminarily, a SDOF main structure is investigated, while it is found that when the frequency detuning occurs on the STMD with variable damping solely, a significant performance degradation is detected; while STMD with variable frequency and damping ratio always has the best control performance. Then, a 40-story benchmark high-rise building with different SSI types is presented as the case study. Numerical results show that STMD can reduce structural displacement responses effectively and has a better control performance than optimal passive TMD for each model. Meanwhile, frequency detuning of passive TMD is discussed and degradation of robustness is found in the passive TMD with ±15 % stiffness detuning. It can be known that proposed STMD has the best control robustness as well, because it is always tuned.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108987"},"PeriodicalIF":4.2,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic design of a low-carbon building constructed with in-situ produced compressed earth blocks","authors":"Noura Zarzour ,&nbsp;Maria Paola Santisi d’Avila ,&nbsp;E. Diego Mercerat ,&nbsp;Luca Lenti ,&nbsp;Michel Oggero","doi":"10.1016/j.soildyn.2024.108990","DOIUrl":"10.1016/j.soildyn.2024.108990","url":null,"abstract":"<div><div>The seismic design of buildings erected using new low-carbon construction materials needs the development of a reliable methodology. In this research, a pilot project of a compressed earth block (CEB) masonry building in a medium-high seismic hazard zone in Southern France is developed. The CEBs are produced in-situ, using a machine, and are used as construction material for low-rise masonry buildings. This innovative low-carbon construction technology permits the reuse of local soil, removed during earthworks, with consequent reduction of energy consumption related to its collection, transport, recovery, and disposal. Even if the CEB masonry building is a promising low-carbon construction, its structural performance assessment, especially in seismic zones, is a challenging issue.</div><div>Starting from the experimental characterization of material mechanical parameters, the seismic design approach focuses on the modal characteristics of the structure, the expected building ductility, and seismic performance assessment in terms of both displacement and force. The behavior factor for a CEB masonry building is an original result of this research. The equivalent frame model adopted for structural design of load-bearing masonry is validated, after the building construction, by comparing the dynamic properties obtained by both numerical and operational modal analysis. Moreover, the modal analysis highlights the impact of the timber slab stiffness on the dynamic response of masonry buildings and suggests that a careful timber slab conception improves the structural behavior under seismic loading.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108990"},"PeriodicalIF":4.2,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142314573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic behavior evaluation of friction-bearing type connection with slit dampers","authors":"Ruyue Liu,&nbsp;Jiawen Jiang,&nbsp;Guiyun Yan,&nbsp;Lianqiong Zheng,&nbsp;Jianbin Wu,&nbsp;Qiulan Lai","doi":"10.1016/j.soildyn.2024.108988","DOIUrl":"10.1016/j.soildyn.2024.108988","url":null,"abstract":"<div><div>Ductility-based design for structural collapse prevention may not be sufficient for the higher performance demand of minimizing the time and cost for function recovery. A friction-bearing type connection with slit dampers was introduced to the beam system at the beam end, and it followed the characteristics of the damage-controlled type connection. The design considerations for the proposed connection were presented and the experimental investigation on the cyclic behavior of the designed specimens was conducted. The results demonstrated that the designed connection exhibited a stable and full hysteresis behavior under cyclic loading, without obvious performance degradation. With a longer slotted hole in the slit damper, the friction-slipping behavior was obvious and the maximum rotation angle could be up to 0.05 rad, while the bearing capacity was enhanced with a shorter slotted hole. The friction-slipping behavior also improved the stress development of main structural members and enhanced the ductile behavior. The proposed connection could develop two-stage energy dissipation behavior, and the frictional slippage was greatly helpful for dissipating energy. The damage concentration was achieved, and the energy dissipated by the proposed connection accounted for more than 75 % of the total dissipated energy. The the inelastic deformation was mainly concentrated in the slit damper, while the beam and the column remained elastic, greatly improving the seismic resilience.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108988"},"PeriodicalIF":4.2,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic analysis of asphalt concrete core rockfill dams considering the bimodulus effect","authors":"Chuang Li ,&nbsp;Zhiqiang Song ,&nbsp;Fei Wang ,&nbsp;Zongkai Wang ,&nbsp;Yunhe Liu","doi":"10.1016/j.soildyn.2024.108984","DOIUrl":"10.1016/j.soildyn.2024.108984","url":null,"abstract":"<div><div>In China, with the extensive development of pumped storage power stations, asphalt concrete core rockfill dams have become the preferred dam type because of their good deformation adaptability and impermeability. In seismic-prone western regions of China, the seismic safety of asphalt concrete cores is particularly important. However, asphalt concrete materials used in hydraulic engineering exhibit significant differences in their tensile and compressive moduli under low-temperature conditions, which has not been considered in existing constitutive models. In this study, a dynamic constitutive model considering the bimodulus effect of asphalt concrete was developed on the basis of dynamic tension and compression tests. Using this model, the influence of the bimodulus characteristics on the dynamic response of the core was investigated. The results indicate that a bimodulus constitutive model can effectively simulate the stress‒strain relationship of asphalt concrete materials at low temperatures. Compared with the bimodulus model, the use of the monomodulus model for calculations results in a significant decrease in compressive stress and a substantial increase in tensile stress of the core. Specifically, using the tensile and compressive monomodulus models led to maximum reductions in tensile stress of 42.9 % and an increase by 336.8 %, respectively. Neglecting the bimodulus effect may lead to misjudgment of the damage area, so the bimodulus effect on the seismic safety of dam cores should not be ignored.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108984"},"PeriodicalIF":4.2,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on practical calculation method of post-earthquake traffic capacity of high-speed railway bridge","authors":"Wangbao Zhou ,&nbsp;Yu Hou ,&nbsp;Lizhong Jiang ,&nbsp;Jian Yu ,&nbsp;Shaohui Liu ,&nbsp;Yulin Feng","doi":"10.1016/j.soildyn.2024.108983","DOIUrl":"10.1016/j.soildyn.2024.108983","url":null,"abstract":"<div><div>High-speed railway bridges are critical lifeline infrastructure during earthquake rescue operations. To effectively evaluate the post-earthquake capacity of high-speed railway bridge, an intensity index system of the post-earthquake track irregularity. spectrum was proposed considering earthquake and structural randomness. A mapping relationship between post-earthquake track irregularity. spectrum intensity index and post-earthquake driving performance index on bridge was established. A practical calculation method for the post-earthquake driving speed threshold of high-speed railway bridge, demonstrating the rationality and effectiveness of this method through case analysis. The results indicated that the post-earthquake driving performance index on bridge correlates approximately linearly with the intensity index of the post-earthquake track irregularity. spectrum. The post-earthquake driving performance targets on bridge can be categorized into safety and comfort targets. The post-earthquake driving performance evaluation criteria based on the comfort target impose stricter speed controls. The practical calculation method for assessing the post-earthquake capacity of high-speed railway bridge is simple, facilitates manual calculations, and possesses significant engineering applicability, providing a solid theoretical foundation for developing post-earthquake emergency plans and the performance-based seismic design of high-speed railway bridge.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108983"},"PeriodicalIF":4.2,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response of flexible pipes buried in sand under multi-directional movement: understanding fault-pipeline interaction","authors":"Mingge Ye ,&nbsp;Pengpeng Ni ,&nbsp;Shubhrajit Maitra","doi":"10.1016/j.soildyn.2024.108978","DOIUrl":"10.1016/j.soildyn.2024.108978","url":null,"abstract":"<div><div>Buried pipelines are an integral part of critical lifeline systems, and span across wide geographic areas to convey fluid products for human use. Due to geohazards, pipelines could be subjected to transverse displacements in different directions, i.e., displacements normal to the pipe axis. However, limited experimental studies have been reported on the response of flexible pipes when subjected to such displacements. In this study, fourteen large-scale multi-directional dragging tests were conducted on polyvinyl chloride (PVC) pipes in dry sand to promote a better understanding of flexible pipe-soil interaction. The soil restraint, midspan deflection, circumferential strain, and longitudinal strain are found to increase with the pipe embedment depth and decrease with the loading angle. It is observed that the design guidelines of ALA (2005) largely overestimate the peak soil restraint on PVC pipes subjected to lateral movement, while the yield displacement for PVC pipes is observed to be much greater than the ALA (2005) recommendation. Also, the calculation method of Nyman (1984) is unable to provide close estimations of peak soil restraint on PVC pipes for different loading angles. A new calculation method is proposed, forming a design chart that can accurately predict the peak soil restraint to different movement directions.</div></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108978"},"PeriodicalIF":4.2,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142311724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear seismic performance of offshore wind turbines on hybrid pile-bucket foundation in sand: Combined earthquake and wind-wave loads","authors":"Wei-Yun Chen ,&nbsp;Yu-Jie Jiang ,&nbsp;Lin-Chong Huang ,&nbsp;Ling-Yu Xu ,&nbsp;Chao Liu ,&nbsp;Guo-Xing Chen","doi":"10.1016/j.soildyn.2024.108981","DOIUrl":"10.1016/j.soildyn.2024.108981","url":null,"abstract":"<div><p>Offshore wind turbines (OWTs) are gaining prominence worldwide, and the hybrid pile-bucket foundation, which combines a monopole and a bucket, has emerged as a noteworthy development. In this study, a 3-D numerical model for the 5-MW OWT was constructed utilizing the OpenSees platform. The dynamic characteristics of the sand was modeled with the PDMY02 constitutive model and the soil was discretized using brick u-p elements. To investigate the dynamic behavior of the OWT in an actual marine environment, the coupled model was subjected to dynamic loadings, encompassing waves, wind, and earthquake. Two seismic motions with different frequency components were considered, respectively. The study focused on exploring the impacts of key influencing factors on the OWT rotation, tower-top acceleration development and spatiotemporal distribution of excess pore water pressure ratio (EPWPR). These factors include dynamic load combinations, earthquake intensity, soil relative density, wind speed, angle between load directions, and pile length. It is revealed that the inclination angle of offshore wind turbines (OWTs) may exceed the allowable threshold under specific conditions of load combinations, seismic motion inputs, and seabed conditions. Thus, it is suggested to appropriately consider the effects of wind and wave actions in the seismic analysis of OWTS.</p></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108981"},"PeriodicalIF":4.2,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simplified analytical solution of bell-spigot jointed ductile iron pipelines crossing normal faults","authors":"Yuanlong Chen ,&nbsp;Jianfeng Li ,&nbsp;Pengpeng Ni ,&nbsp;Zhiwang Lu","doi":"10.1016/j.soildyn.2024.108955","DOIUrl":"10.1016/j.soildyn.2024.108955","url":null,"abstract":"<div><p>Bell-spigot jointed ductile iron pipelines are increasingly used, which are highly susceptible to permanent ground deformation. It is necessary to predict their responses under normal fault conditions. This investigation presents an analytical approach that simplifies the pipeline as a beam-type structure resting on discrete Winkler foundation comprising discrete springs, connected by shear and torsional springs at the bell-spigot joints, which is solved by the finite difference method. Comparisons of pipe deflection and joint rotation with the results from two full-scale experiments confirm the effectiveness of this method. Parametric analysis is conducted with respect to soil modulus, location of peak curvature, burial condition, pipe diameter, and joint rotational stiffness. It is found that increase in soil modulus can deteriorate the deformation of pipe bodies. Concentration of shear zones intensifies the responses of both pipeline segments and bell-spigot joints. For deeply buried jointed pipelines, less compacted backfills can reduce the soil-pipe interaction forces, mitigating the detrimental impact of fault rupture. A concept of relative joint-pipe stiffness ratio, <em>R</em>, is introduced to describe different joint rotational stiffness, identifying the threshold of <em>R</em> = 10 % for transition between jointed and continuous pipelines. Considering different failure limits, joint rotation failure always occurs earlier than pipe bending failure.</p></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108955"},"PeriodicalIF":4.2,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the seismic responses and differences between rock-socketed single pile and pile group foundations under different scour depths","authors":"Zhang Chengcheng,&nbsp;Feng Zhongju,&nbsp;Zhang Cong,&nbsp;Wang Fuchun,&nbsp;Wang Xiqing","doi":"10.1016/j.soildyn.2024.108971","DOIUrl":"10.1016/j.soildyn.2024.108971","url":null,"abstract":"<div><p>The effects of scour depth on the seismic responses of rock-socketed single pile foundations and 2 × 2 pile group foundations were investigated by shaking table tests, and the seismic performance and differences of these two foundation types were analyzed. The test results show that increasing scour depth causes liquefaction to occur earlier but also accelerates the dissipation of pore water pressure. Pile acceleration, pile top displacement, and pile bending moment all increase with increasing in scour depth. The pile top acceleration and amplification factor of the pile group increase steadily and linearly with increasing scour depth, while those of the single pile increase abruptly at the anchorage ratio of 4.6. The acceleration amplification effect is also susceptible to the types of soil layers and the stiffness of the pile body. The stability of pile group deformation is assessed to be superior to that of single pile based on the amplification intersection line. The maximum bending moment of the pile body arises at the interface between saturated sand and strongly weathered granite, and its location does not shift with increasing scour depth. Increasing scour depth not only amplifies the adverse effects of seismic excitation on pile acceleration, pile top displacement, and pile bending moment but also amplifies the differences in seismic performance and liquefaction resistance of these two foundation types. Based on the research results, pile group foundations have better seismic performance than single pile foundations because of the load-sharing effect of the pile group under different scour depths. Therefore, pile group foundations can provide more stable support in scour-prone areas.</p></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108971"},"PeriodicalIF":4.2,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic centrifuge modeling on the superstructure–pile system considering pile–pile cap connections in dry sandy soils","authors":"Gang Zheng ,&nbsp;Wenbin Zhang ,&nbsp;Davide Forcellini ,&nbsp;Haizuo Zhou ,&nbsp;Jihui Zhao","doi":"10.1016/j.soildyn.2024.108979","DOIUrl":"10.1016/j.soildyn.2024.108979","url":null,"abstract":"<div><p>In conventional designs, the pile and pile cap are typically considered rigid connections. However, this type of connection experiences a concentrated force during earthquakes, leading to frequent damage at the pile heads. To mitigate pile head damage, semirigid pile‒pile cap connections are proposed. Centrifuge shaking table tests were conducted to investigate the seismic response of the superstructure‒pile foundation system. Two layers of Toyoura sand, including a moderately dense upper layer and a denser bottom layer, were used as the foundation soil. The superstructure was simplified as lumped masses and columns with two different heights and periods. The foundation consisted of a 3 × 3 group of piles. Rigid and semirigid pile‒pile cap connections were evaluated. The experiments investigated the effect of connection type on the distribution of bending moments in the piles and analyzed the acceleration and displacement responses of the superstructure under different pile‒pile cap connections. According to the results, semirigid connections reduced the peak bending moment at the pile head by 50–70 %, especially for low-rise superstructure cases. The influence depth of the connection type on the pile bending moment reaches approximately 10 times the pile diameter. For low-rise superstructure cases, semirigid connections slightly reduced the natural frequency of the superstructure, leading to a decrease in the superstructure acceleration during earthquakes with a short dominant period. The semi-rigid connections reduce the rotation of foundations but promote the translational displacement of foundations. For the mid-rise superstructure cases, semirigid connections reduce the translational displacement and increase the rotational displacement of the foundation. These experiments provide insights into the seismic performance of superstructure‒pile foundation systems with different pile‒pile cap connections and can serve as a reference for seismic design in similar engineering practices.</p></div>","PeriodicalId":49502,"journal":{"name":"Soil Dynamics and Earthquake Engineering","volume":"187 ","pages":"Article 108979"},"PeriodicalIF":4.2,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}