PCI Journal最新文献_第7页

Seismic design and analysis of precast concrete buckling-restrained braced frames 预制混凝土屈曲约束支撑框架抗震设计与分析

IF 1.1 4区工程技术

PCI Journal Pub Date : 2021-01-01 DOI: 10.15554/pcij66.5-03

S. Oh, Y. Kurama, Jon Mohle, B. Saxey

{"title":"Seismic design and analysis of precast concrete buckling-restrained braced frames","authors":"S. Oh, Y. Kurama, Jon Mohle, B. Saxey","doi":"10.15554/pcij66.5-03","DOIUrl":"https://doi.org/10.15554/pcij66.5-03","url":null,"abstract":"This paper describes a numerical evaluation of the seismic design of precast concrete buckling-restrained braced frames based on the Federal Emergency Management Agency’s Quantification of Building Seismic Performance Factors (FEMA P695) methodology. A set of 32 archetype braced frames covering a range of parameters were designed using a procedure consistent with current U.S. building code requirements. Nonlinear numerical models were developed and verified against existing experimental data. The results show that large axial compression and tension forces develop in both beams and columns, thus requiring these members to be designed with large reinforcement ratios or higher-grade reinforcing bars and beams to be designed like column members. Recommended beam and column effective (cracked) linear-elastic axial and flexural stiffness reduction factors provide reasonable estimates of story drifts and brace deformations under design lateral forces. Nonlinear monotonic static pushover and incremental dynamic analyses of the archetypes support an overstrength factor of 2.5, response modification coefficient of 8, and deflection amplification factor of 8 for the seismic design of this system.","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67574630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Post-fire seismic performance of precast reinforced concrete columns 预制钢筋混凝土柱火灾后抗震性能研究

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-11-01 DOI: 10.15554/pcij65.6-01

U. Demir, M. Green, A. Ilki

{"title":"Post-fire seismic performance of precast reinforced concrete columns","authors":"U. Demir, M. Green, A. Ilki","doi":"10.15554/pcij65.6-01","DOIUrl":"https://doi.org/10.15554/pcij65.6-01","url":null,"abstract":"Quantifying the seismic resistance of reinforced concrete buildings after fire is difficult because of the lack of information regarding their strength and ductility under earthquake loads. In this study, four full-scale flexure-controlled reinforced precast concrete columns were subjected to quasi-static reversed cyclic lateral loading under constant axial load to examine the seismic response of reinforced precast concrete columns damaged by 30, 60, and 90 minutes of fire. For the first time, the impact of fire damage on force-displacement behavior, moment-curvature relationship, stiffness, energy dissipation capacity, and residual displacements was investigated through postfire seismic tests. Test results clearly indicated that the fire exposure did not significantly affect the lateral-load-bearing capacity, failure modes, and ductility of the columns, with the exception of the specimen subjected to 90 minutes of fire exposure. The analytical study consisting of thermal and fiber-based structural analysis demonstrated that conventional principles of structural mechanics are valid for estimation of the postfire seismic behavior of reinforced precast concrete columns when the deteriorations in materials are realistically taken into account and the given algorithm is followed.","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":"65 1","pages":"62-80"},"PeriodicalIF":1.1,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43977126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Background for the new PCI recommended practice on strand bond PCI推荐的股线粘合新做法的背景

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-11-01 DOI: 10.15554/pcij65.6-05

J. Brewe

引用次数: 0

Making offices and construction sites safer from SARS-CoV-2 使办公室和建筑工地更安全，免受SARS-CoV-2的侵害

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-11-01 DOI: 10.15554/pcij65.6-04

J. Nasvik

引用次数: 2

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-11-01 DOI: 10.15554/pcij65.6-06

引用次数: 1

Flexural design of precast, prestressed ultra-high-performance concrete members 弯折设计预制、预应力超高性能混凝土构件

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-11-01 DOI: 10.15554/pcij65.6-02

Chungwook Sim, M. Tadros, D. Gee, Micheal Asaad

引用次数: 7

Development of a double-tee flange connection using shape memory alloy rods 形状记忆合金杆双三通法兰连接的研制

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-11-01 DOI: 10.15554/pcij65.6-03

R. Anay, L. Assi, V. Soltangharaei, A. Abdulshaheed, H. Gleich, P. Ziehl

{"title":"Development of a double-tee flange connection using shape memory alloy rods","authors":"R. Anay, L. Assi, V. Soltangharaei, A. Abdulshaheed, H. Gleich, P. Ziehl","doi":"10.15554/pcij65.6-03","DOIUrl":"https://doi.org/10.15554/pcij65.6-03","url":null,"abstract":"This study investigated the out-of-plane shear performance of a newly developed shape memory alloy (SMA) connector and a commonly used shear/alignment connector. The innovation lies in developing a durable and easily installed and maintained flange-to-flange connector between precast concrete double-tee members. The proposed connector consists of a superelastic SMA curved bolt inserted into a duct that is then cast into the precast concrete member. Two types of sealant materials were used: polyurethane elastomeric sealant and nonshrink cementitious grout. The shear/alignment and SMA connectors were tested under monotonic vertical shear. The tests were conducted on 4 ft × 4 ft × 4 in. (1.2 m × 1.2 m × 100 mm) slab specimens. The resulting capacities and associated damage were summarized. Higher stiffness and lower ductility were observed for the SMA connector with nonshrink grout compared with the shear/alignment connector with polyurethane elastomeric sealant. The average stiffnesses of the SMA and shear/alignment connector specimens were 116,681 lb/in. (20,434 kN/m) and 31,300 lb/in. (5481 kN/m), respectively. The ductility of the SMA connector was improved when using polyurethane elastomeric sealant; however, more tests should be done to confirm this behavior. The SMA rod was reused in several tests through reheating of the SMA element. The shear/alignment connector cannot be reused.","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":"65 1","pages":"81-96"},"PeriodicalIF":1.1,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44382117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Lateral Stability and Concrete Strength Requirements for Precast, Prestressed Concrete Components 预制、预应力混凝土构件的横向稳定性和混凝土强度要求

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-01-01 DOI: 10.15554/pcij65.2-02

Stephen J. Seguirant, R. Brice, A. Mizumori, B. Khaleghi

{"title":"Lateral Stability and Concrete Strength Requirements for Precast, Prestressed Concrete Components","authors":"Stephen J. Seguirant, R. Brice, A. Mizumori, B. Khaleghi","doi":"10.15554/pcij65.2-02","DOIUrl":"https://doi.org/10.15554/pcij65.2-02","url":null,"abstract":"The allowable level of temporary concrete compressive stress in precast, prestressed concrete components has been a source of debate in t e co cr te industry for many years. Traditionally, hese str sses have been considered to originate ly from the effects f prestress combined with he self-w ight of a plumb component, evaluated about the major axis. The maximum compressive stress divided by the coefficient of the compressive stress limit det rmines th r quired concrete strength. Although these emporary stresses can occur at any time f om fabrication through erect on into the structure, the critical case is usually at transfer of prestress and subsequent lifting from the form. At this stage, the prestress force is higher and the concrete strength is lower than at any other point in the life of the component. At this early age, concrete is also more susceptible to damage from high compressive stress. As materials and fabrication capabilities in the precast, prestressed concrete industry advance, components are becoming longer and slenderer, particularly within the transportation sector. Such components require serious consideration of lateral stability during handling, which introduces bending about the minor axis. This lateral bending will increase maximum tensile and compressive stresses at the extremities of the component. These localized stresses traditionally have not been used to determine the required concrete strength, and doing so at current stress limits can significantly increase the required concrete strength. This paper is intended to reconcile the interaction between the temporary concrete compressive stresses traditionally used to determine the required concrete strength and the requirements for lateral stability, primarily the additional stresses due to lateral bending. The assumption is made that compressive stresses govern the determination of the required concrete strength. It is normally not efficient to determine the required concrete strength based on tensile stresses, which can be satisfied in a different manner.","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":"65 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67572842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Rational Approach for Fire-Resistance Evaluation of Double-Tee, Prestressed Concrete Slabs in Parking Structures 停车场结构双三通预应力混凝土板耐火性能评估的合理方法

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-01-01 DOI: 10.15554/pcij65.2-01

Puneet Kumar, V. Kodur

引用次数: 2

Debonding strands as an anchorage zone crack control method for pretensioned concrete bulb-tee girders 先张混凝土球字梁锚固区裂缝控制方法的研究

IF 1.1 4区工程技术

PCI Journal Pub Date : 2020-01-01 DOI: 10.15554/pcij65.5-04

Emre Kizilarslan, Pinar Okumus, M. Oliva

引用次数: 2