带接头预制混凝土梁挠度的行为研究

STUDY ON DEFLECTION BEHAVIOR OF PRECAST CONCRETE BEAMS WITH JOINTS

预制混凝土模块之间的接头在分析时应充分考虑稳定性和适用性。现有的研究只涉及稳定性,而关于适用性的研究及挠度和裂缝的发展是缺乏的。本研究考虑现场浇筑与预制混凝土强度的差异,旨在准确评价搭接缝内有接头的预制混凝土受弯构件的挠度。此外,为反映初裂缝,通过拉伸硬化计算和评估挠度,重新定义裂缝面左、右两侧的附加传输长度为新的裂缝区。由于明确考虑接头的传输长度和混凝土强度的特性,提出的挠度计算方法更准确。

The stability and applicability of the joints between the modules of precast concrete should be fully considered in the analysis.Existing research only involves stability,and research on applicability,including deflection and crack development,is lacking.This study considers the difference in strength between on-site pouring and precast concrete,aiming to accurately evaluate the deflection of precast concrete flexural members with joints in lap joints.In addition,in order to reflect the initial crack,the additional transmission length on the left and right sides of the crack surface is redefined as a new crack zone by tensile hardening calculation and evaluation of deflection.Since the transmission length of the joint and the strength of the concrete are explicitly considered,the deflection calculation method proposed in this paper is more accurate.