PCI Journal最新文献_第10页

Behavior Of Structural Macrosynthetic Fiber-Reinforced Precast, Prestressed Hollow-Core Slabs at Different Flexure-to-Shear Ratios 不同弯剪比下宏观合成纤维预制预应力空心芯板结构性能研究

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.3-01

Pradeep Kankeri, S. K. S. Pachalla, N. Thammishetti, S. Prakash

{"title":"Behavior Of Structural Macrosynthetic Fiber-Reinforced Precast, Prestressed Hollow-Core Slabs at Different Flexure-to-Shear Ratios","authors":"Pradeep Kankeri, S. K. S. Pachalla, N. Thammishetti, S. Prakash","doi":"10.15554/pcij64.3-01","DOIUrl":"https://doi.org/10.15554/pcij64.3-01","url":null,"abstract":"■ ■ The paper reviews available literature related to fiber-reinforced concrete as well as provides results of full-scale testing conducted on hollow-core slabs specimens and reviews the applicability of analytical modeling. The main advantages of using precast concrete elements, such as hollow-core slabs, are high quality control and reduced construction time. Hollow-core slabs have longitudinal voids running along the spans, which reduces the slab’s weight and creates a more efficient cross section for prestressing. Hollow-core slabs are usually designed as uncracked elements under service loads. However, if a structure is overloaded due to change in use, architectural modifications, or material degradation, these elements can crack and may not meet the required serviceability design criteria. Because hollow-core slabs are produced via an extrusion process, the provision of additional reinforcement is not feasible. In such scenarios, the addition of structural synthetic fibers to the concrete during casting can enhance the performance of the slabs after cracking. Current American Concrete Institute (ACI) codes require at least 60 kg (130 lb) of deformed steel fibers per cubic meter of concrete for shear reinforcement. However, in prestressed hollow-core slabs, the beneficial effect of prestressing forces could relax the minimum fiber volume requirement.","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67571704","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: 4

Effect Of Deck Cracking On Prestress 桥面开裂对预应力的影响

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.3-04

Soumya Vadlamani, Richard A. Miller, G. Rassati

引用次数: 0

Seismic Design Of Precast Concrete Rocking Wall Systems With Varying Hysteretic Damping 变滞回阻尼预制混凝土摇墙抗震设计

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/PCIJ64.5-04

M. Nazari, S. Sritharan

引用次数: 7

Panelization And Connections For Rapid Erection Of High-Rise Elevator And Stair Cores 高层电梯、楼梯核心快速安装用面板及连接

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.5-01

Charles E. Van Kampen, Alex Mihaylov

引用次数: 1

Analysis Of Bonded Link Slabs In Precast, Prestressed Concrete Girder Bridges 预制、预应力混凝土梁桥粘结连接板分析

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.3-03

A. Gergess

引用次数: 3

Behavior Of Compact L-Shaped Spandrel Beams With Alternative Web Reinforcement 可选腹板配筋的l型梁的受力性能

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.2-04

V. Hariharan, G. Lucier, S. Rizkalla, P. Zia, G. Klein, H. Gleich

{"title":"Behavior Of Compact L-Shaped Spandrel Beams With Alternative Web Reinforcement","authors":"V. Hariharan, G. Lucier, S. Rizkalla, P. Zia, G. Klein, H. Gleich","doi":"10.15554/pcij64.2-04","DOIUrl":"https://doi.org/10.15554/pcij64.2-04","url":null,"abstract":"Open web reinforcement has been shown to be an effective alternative to closed stirrups in the webs of slender precast concrete L-shaped spandrel beams subjected to combined shear and torsion. For slender beams, an open reinforcement scheme is a better alternative to the traditional closed stirrups mandated by the American Concrete Institute’s (ACI’s) Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14) because the beams are easier to produce with open reinforcement. Although the behavior of slender L-shaped beams (having aspect ratios of 4.5 or greater) with open web reinforcement has been well documented, the use of alternatives to closed stirrup reinforcement for compact L-shaped cross sections having aspect ratios much less than 4.5 has not been investigated previously. This paper presents an experimental study in which four full-scale, 46 ft (14 m) long, precast concrete, compact L-shaped beams were tested to failure. One of the test specimens served as a control and was designed with traditional closed stirrups. The remaining three beams were designed with alternative open and segmented reinforcement configurations. The results of the study demonstrate the viability of replacing closed stirrups with alternative open and segmented web reinforcement in compact L-shaped span-","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67571692","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: 5

Cyclic Behavior Of Hollow-Core Diaphragm Subassemblies 空心膜片组件的循环性能

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.2-02

N. Angel, J. Correal, J. Restrepo

引用次数: 2

Precast Concrete–To–Precast Concrete Facade Joints Using Precompressed Expandable Foam 预制混凝土对预制混凝土立面接缝使用预压缩可膨胀泡沫

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.6-05

Edward S. Farmington, T. Anderson, L. Grant, Rita L. Seraderian

{"title":"Precast Concrete–To–Precast Concrete Facade Joints Using Precompressed Expandable Foam","authors":"Edward S. Farmington, T. Anderson, L. Grant, Rita L. Seraderian","doi":"10.15554/pcij64.6-05","DOIUrl":"https://doi.org/10.15554/pcij64.6-05","url":null,"abstract":"■ Specimens constructed with the industry standard of dual sealant and backer rod were also tested to serve as the control specimens and benchmark for data comparison. This paper discusses precompressed expandable foam as an option for sealing the joints of an architectural precast concrete panel building enclosure (referred to as precast concrete). The building enclosure is defined as the physical component or system of components of a building that separates the interior from the exterior environment. Architectural precast concrete building enclosures provide the facade of the building with more than just the environmental separation. Architectural precast concrete has had a successful long-term track record of use for building enclosures to control water and air penetration. Precast concrete wall designs are typically specified with a two-stage sealant joint between the concrete elements. This industry has accepted and recommended this approach. All exposed joint sealants require inspection, maintenance, and repair over time. Typical sealants degrade over time, and exposure to weather and ultraviolet rays can result in delamination and, subsequently, water leakage through the joint.","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67572482","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: 4

Using Belitic Calcium Sulfoaluminate Cement For Precast, Prestressed Concrete Beams 用白石质硫铝酸钙水泥预制预应力混凝土梁

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.2-03

C. Murray, Royce W. Floyd, C. Ramseyer

引用次数: 7

Simplified Methodologies For Preliminary Blast-Resistant Design Of Precast Concrete Wall Panels 预制混凝土墙板初步抗爆设计的简化方法

IF 1.1 4区工程技术

PCI Journal Pub Date : 2019-01-01 DOI: 10.15554/pcij64.4-03

Omar M. Alawad, Matthew J. Gombeda, Clay J. Naito, S. Quiel

{"title":"Simplified Methodologies For Preliminary Blast-Resistant Design Of Precast Concrete Wall Panels","authors":"Omar M. Alawad, Matthew J. Gombeda, Clay J. Naito, S. Quiel","doi":"10.15554/pcij64.4-03","DOIUrl":"https://doi.org/10.15554/pcij64.4-03","url":null,"abstract":"■ The authors have created a spreadsheet-based tool, following the normalization approach, for use during preliminary design. Precast concrete wall panels are commonly used for exterior building envelopes due to their installation efficiency, high quality control, and design flexibility. For facilities that are vulnerable to explosive threats, these panels often serve as the first line of defense against blast loading and are commonly detailed to resist these severe impulsive loads, in addition to conventional loading requirements. Blast demands are considered for antiterrorism and force protection applications, such as government buildings and military installations, or for facilities at risk of accidental vapor cloud explosions, such as petrochemical or industrial processing facilities. Due to the dynamic nature of blast loading conditions, specialized design and analysis methods are needed to quantify structural response and determine the extent of component damage following a blast event. These methods can be computationally expensive and require the knowledge and expertise of a blast design specialist. For these reasons, it is not always feasible for precast concrete producers to readily assess the blast-resistant performance of a wall panel system during the early design stages and bidding processes. This paper evaluates two simplified methodologies for the preliminary design of precast concrete wall panels to resist blast loading. Using efficient and computationally inexpensive approaches, these methods allow the user to rapidly assess the blast resistance of a given panel design, thereby facilitating a more accurate estimation of fabrication and installation costs during the bidding phase. An interactive design tool based on one of these methods has been developed by the authors to facilitate the evaluation of a broad range of panel constitutive parameters and increase Simplified methodologies for preliminary blast-resistant design of precast concrete wall panels","PeriodicalId":54637,"journal":{"name":"PCI Journal","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67572234","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: 5